Numbers 9:14

14 “ ‘A foreigner residing among you is also to celebrate the LORD’s Passover in accordance with its rules and regulations. You must have the same regulations for both the foreigner and the native-born.’ ”

Read Numbers 9:14 Using Other Translations

And if a stranger shall sojourn among you, and will keep the passover unto the LORD; according to the ordinance of the passover, and according to the manner thereof, so shall he do: ye shall have one ordinance, both for the stranger, and for him that was born in the land.
And if a stranger sojourns among you and would keep the Passover to the LORD, according to the statute of the Passover and according to its rule, so shall he do. You shall have one statute, both for the sojourner and for the native."
And if foreigners living among you want to celebrate the Passover to the LORD, they must follow these same decrees and regulations. The same laws apply both to native-born Israelites and to the foreigners living among you.”

What does Numbers 9:14 mean?

John Gill's Exposition of the Bible
Numbers 9:14

And if a stranger shall sojourn among you, and will keep the
passover unto the Lord
Then he must become a proselyte of righteousness, and be circumcised, or otherwise be might not eat of the passover, ( Exodus 12:48 ) ; Ben Gersom interprets this of the second passover, and of a proselyte that was not obliged to the first, he not being then a proselyte, but became one between the first and the second; and so Aben Ezra understands it of a second passover, though he observes, that some say the first is meant:

according to the ordinance of the passover, and according to the
manner thereof, so shall he do;
according to the several rites and ceremonies, whether of the first or second passover, that an Israelite was obliged to observe, the same a proselyte was to observe, and what they were has been already taken notice of:

ye shall have one ordinance, both for the stranger and for him that
was born in the land:
for a proselyte, and a native of Israel; see ( Exodus 12:49 ) .

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